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DCHP/DNS server
bbarrick
Member Posts: 242 ■■■□□□□□□□
in CCNA & CCENT
When setting up a DHCP server, specifically I guess if it matters any on a Cisco router, what is the purpose of configuring a DNS server ip?
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silverp1
Member Posts: 124
The DHCP server will do a few things beyond assign IP's, it can also give hosts default gateways, DNS server IP's, domain names and a bunch of other stuff. By giving the DHCP server a DNS server address, it will provide this information to any host that requests it.Certs: CCENT, CCNA:R&S
Working on: MCITP:SA
Goals: CCENT (ICND1) [Done], CCNA (ICND2) [Done], MCITP:SA -
Optionsbbarrick
Member Posts: 242 ■■■□□□□□□□
Ok, that makes sense. I had just read that but after reading through the configuration I lost track of the other things that it does. I was thinking maybe DHCP used the DNS server for something else. But it just uses the IP to the DNS, there's no real interaction between DNS and DHCP right?
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iamme4eva
Member Posts: 272
Correct. It tells the client where it's DNS server is.
Essentially, if you statically assign an IP in Windows, you get 5 boxes - the bottom two are the DNS server IP's. What you set on the DHCP server tells the client what to put in those boxes.Current objective: CCNA Security
My blog: mybraindump.co.uk -
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pamccabe
Member Posts: 315 ■■■□□□□□□□
From what I understand, you can configure a cisco router to act as a dns server. However, it might be a CCNP related topic, because I've never read anything about it in any CCNA material. -
Optionsbbarrick
Member Posts: 242 ■■■□□□□□□□
From what I understand, you can configure a cisco router to act as a dns server. However, it might be a CCNP related topic, because I've never read anything about it in any CCNA material.
It's on the CCENT now. -
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Mrock4
Banned Posts: 2,359 ■■■■■■■■□□
Example of configuring a router to function as a DNS server:
http://www.sgtccie.com/images/DNS_server.png (contains a screenshot of the config, as well as an example)
Topology is: R2
R3
R10
R3 is the DNS server, and the example shows R2 resolving R10 via R3. -
Optionstheodoxa
Member Posts: 1,340 ■■■■□□□□□□
I don't know if there's more that I don't know about, but my understanding is that DNS on a Cisco Router is very limited (no PTR, CNAME, DNAME, etc..., just A, MX, and SRV records) in what types of records you can create and I didn't see any way to create zones. I assume you just give the FQDN for each record. I'd just stick with BIND9 on a Linux box or VM.R&S: CCENT → CCNA → CCNP → CCIE [ ]
Security: CCNA [ ]
Virtualization: VCA-DCV [ ] -
OptionsMrock4
Banned Posts: 2,359 ■■■■■■■■□□
I have never implemented DNS in a production environment on a router, and frankly don't see a reason to- just wanted to show it in action.
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Optionsbbarrick
Member Posts: 242 ■■■□□□□□□□
It's on the CCENT now.
Oops, I should clarify DHCP configuration on a router is on the CCENT, not DNS.
